Oil seal construction for rotary combustion engine



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oml Smilx con-STRUQTIGN'; Eom Renfrew coMaUsvrLIoNl' mwa-NE;

FHM" MW 159535 a, sheen-swam; 1@

ATTmBNnY April 27, 1965 c. JQNES ETA. 3,180,563

OIL S f //j\Y 54 22 im l0 l '06 n 104 l 102 i oa/ l "2 l 78 /5 H4 G j G/ a JL- a 7 INVENT Rs 7 1H/wa E BY ff/M EGM JLM 2 4 ATTDRNQY nited States Patent C poration of Delaware Filed May 13, 1%3, Ser. No. 279,304 6 Claims. (Cl. 23d-145) This invention relates to rotary combustion engines and in particular to a novel and improved oil seal for such engines. Although the invention is particularly applicablo to rotary combustion engines and will be herein described in relation thereto, it should also be understood that the invention may be used with other types of rotary mechanisms or in other mechanisms where an effective means is required for sealing against oil leakage. A rotary combustion engine of the type described herein is clearly disclosed in United States Patent 2,988,065 issued to Felix Wankel et al.

In general, engines of this type comprise an outer body formed by a peripheral wall interconnected by a pair of parallel end walls thereby defining a cavity whose peripheral shape preferably is basically an epitrochoid. A rotatably mounted rotor is supported on a shaft within the cavity, the outer surface of which defines a plurality of circumferentially-spaced apex portions having radially movable seal strips mounted therein for sealing engagement with the inner surface of the peripheral wall thereby forming working chambers which upon relative rotation and an ignition means may be provided for igniting the fuel-air mixture whereupon the stages of intake, compression, expansion and exhaust may be carried out. Of course, it should be understood that the ignition means is intended to include ignition as in the diesel cycle, as the of the type described above which may be operated as a invention contemplates use in a rotary combustion engine diesel engine.

A lubrication system is provided for lubricating the engine shaft and bearings and includes means for supplying lubricating oil to the interior of the rotor for cooling purposes. As is well known in internal combustion engines, it is desirable to prevent the lubricating oil from leaking into the zone of the engine Where combustion gases are present in order to minimize the oil consumption. It is equally important to prevent the combustion gases from leaking into the crankcase or oil reservoir as this will also lead to contamination of the oil as well as loss of compression.

it is generally the practice in piston-type internal combustion engines to provide an oil seal ring around the lower end of each piston. In rotary combustion engines of the type described herein the oil seal ring is mounted in the rotor end walls for sealing contact with the inner faces of the end walls of the engine housing. The rotor traces an epitrochoid path during its rotation and is also subject to slight axial movements relative to the housing end walls and, since the oil seals are mounted in the rotor, the oil seals must be capable of axial movement relative to the rotor for maintaining sealing contact with the housing end walls while tracing an epitrochoid path with the rotor. It has also been found that some gases will leak from the working chamber 4and iow between the rotor and the housing end walls and exert pressure on the oil seals tending to twist or pivot said oil seals in their grooves thereby moving the sealing surface of the seal member ont 3,lbd5b3 Patented Apr'. 27, 1h65 lCe of contact with the housing end walls, resulting in leakage of oil past the seal rings.

lt is a primary purpose of the present invention to provide a. novel and improved oil seal means which is pressure balanced for minimizing twisting or pivoting of the seal ring in its groove and which seal ring is maintaned in scraping sealing contact with the housing Vend walls by a spring force. The invention is generallycarried out by providing a seal ring having substantially edge Contact with the inner face of the adjacent housing end wall with said seal ring being biased into contact with said end wall by a Belleville-type spring. The spring and seal ring are in cooperating engagement vsuch thatl the axial spring force component from said spring acts lon a line through the contact region of the seal member in order to minimize any bending or twisting the seal ring out of contact with the end wall or in other words to prevent the contacting edge of the seal member from turning away from its contact region with said end wall.

Preferably the oil seal ring and its spring are arranged to permit gas pressure," which may leak from the working chambers to the region of the oil seal, to flow into the oil seal groove behind the seal member so that the gas pressure acting in an axial direction on the outer seal surface of the'seal ring is opposed by the gas pressure acting on the back side of the seal ring and these opposing pressures preferably are substantially in balance. By this construction the contacting sealing edge of the seal ring is kept in rm sealing contact with the associated sealing surface on the housing end wall and the seal contact pressure is substantially unaffected by gas pressure forces or other forces tending to force the seal member out of sealing contact. As a result oil leakage past the oil seal is minimized and oil consumption is kept at a minimum.

Accordingly it is one object of the invention to provide a novel and improved oil seal construction for a rotary combustion engine.

lt is another object of the invention to provide a novel and improved pressure balanced oil seal construction for a rotary combustion engine.

lt is a further object of the invention to provide a novel and improved oil seal construction for a rotary combustion engine wherein the seal ring is urged into sealing edge contact by a force acting through the line of contact of said seal ring and its associated sealing surface.

It is an additional object of the invention to provide a novel and improved oil seal construction for a rotary combustion engine wherein means are provided for maintaining substantially constant sealing contact between the seal member and its associated sealing surface.

Other ompects and advantages of the invention will become-apparent upon reading the following detailed description with the accompanying drawing wherein:

IFIG. lis a sectional View of a rotary combustion engine embodying the invention;

FIG. 2 is a sectional view taken along line 2-2 o-f FIG. 1;

FIG. 3 is an enlarged sectional View of a portion of the rotary combustion engine taken along line 3--3 of FIG. 2;

FIG. 4 is an enlarged sectional View of the oil seal construction of PIG, 3 and diagrammatically illustrating the forces acting therein; and

FIG. 5 is a view similar to FIG. 3 illustrating another embodiment ofthe invention.

In FlGS. -1 and 2 there .is shown a rotary combustion engine having an outer body or housing generally designated `at lll composed of a pair of end walls 12 and ld interconnected by a peripheral Wall 16 forming a cavity therein having an `axis 15. As shown, for example in FIG. 2 the profile of the inner surface of the outer body peripheral wall i6 preferably is basically a two-lobed epitrochoid. Al hollow shaft 18 is rotatably mounted co-axial with the cavity and has an eccentric portion 2i? fonmed thereon upon which is rotatably mounted. a rotor 22 having three circunrferentially spaced apex portions 24, as sho-wn in FIG. 2 which apex portions 24 are in sealing cooperation with the inner surface 26 of the outer body to forrn a plurality of working chambersy 2S which upon relative rotation of the outer `body 10 and rotor 22 vary in volume. Seal strips 3d are mounted partly in grooves provided in each apex portion and partly in intermediate seal bodies 32 mounted in said grooves and extend from one end face of the rotor to the other end face lfor continuo-us sealing engagement with the inner surface 26 of the peripheral =wall 16 and thereby sealing the working chambers 2S. End face seals 34 are also provided in each end face of the rotor and are in sealing 4' cooperation with seals 3i? and 32 to prevent leakage of the gases from the working chambers 28 in the regions between the end faces of the rotor and the housing end walls. A suitable bearing 36 is supported in the rotor 22 -for rotatively supporting the rotor on the eccentric 2i).

An annulus 3d is cut `out from the inner contour of theY bearing' and communicates with an oil supply passage 4t? in the shaft 1S through an oil passage 42 for supplying oil to the contacting surfaces of the bearing and eccentric. The oil supply passage 4@ in shaft 1S is suitably connected to an oil pump (not shown), in a well known manner, for supplying oil under pressure to said oil supply passage 40. Suitable bearings 44 and 46 are also mounted .in the end walls 12 and 14 as shown in FIG. l, for supporting the rotating shaft 18 in the outer body end walls 12 and 14 with said bearings 44 and 46 each being provided with an annulus 48 and Sil, respectively, in its bearing liner and communicating with oil passages 52 and 54 from the oil supply passage 40.

An externally-toothed gear 56 surrounds one of the shaft bearings, for example, the bearing 46, and is securedL to the outer body end wall 14 by bolts 58. The gear 56 is disposed in meshing engagement with an internally-toothed gear dit mounted on the rotor 22 `adjacent an end face oft they rotor. The internal gear 60 has a plurality of cirournferentially-spaced bosses 62 formed thereon which abut corresponding bosses 64 on the interior of the rotor and screws 66 passing through the bosses 62 are `nhreaded into the bosses 64 serve to secure* the gear e2 to the rotor. The gears 56 and 6d serve to help rotatively position the rotor with respect to .the epitrochoidal surface of the peripheral wall 16. In 'the embodiment illustrated havingV Y a two-lobed epitrochoid and a three 4lobed rotor, the ratio of rotation of the shaft eccentric with respect to the rotor is 3:1 wherein for each rotation of the rotor about its axis the eccentric rotates three times around the axis of its shaft.

An intake port 68 (see FIG. 2) is provided in the peripheral wall 16 .for admitting air and/ or a fuel-air mixture, an ignition means 70 may be provided for igniting the mixture and an exhaust port '72 is provided in peripheral wall 16 for expelling the :burnt gases so that the stages of intake, compression, expansion and exhaust may be carried out.

The rotor 22 may be made hollow and has a plurality of circumferentially-spaced compartments 74 separated by webs 76, said `compartments. extending over the entire rotor interior. The compartments 7 4 are preferably further divided by an annular web 78 disposed transverse to the rotor axis and extending from the rotor hub portion 89 to the peripheral wall 82 of the rotor. As shown in FIG. l, the rotor hub portion 8d terminates shortof the rotor end walls 84 and 86 and also on the gear side short of the gear member 60 sothat an annular gap S8 is formed at each end of the rotor hub portion for allowing a coolant to flow in and out of the compartments 74.

During l rotation of the shaft 18 with its eccentric 29, the bearings at 94. Thus, it will be Aseen that'lubricating oil is provided. to the engine yfor lubricating the bearing surfaces and for cooling the interior of the rotor. Reference may be made to co-pending application Serial No. 206,753 entitled Cooling System for a Rotary Mechanism filed. on luly 2, k1962, and Vinvented iby Max Bentele, Charles Jones and Alexander H. Raye, for a more detailed description of the oil circulation for lubricating and cooling, which in `itself forms nopart of the present invention.

It will be apparent that, during operation of the engine, a substantial quantity of Voil -will collect in the annular `cavity region 94-on each side of the rotor between the rotor end faces and the adjacent outer body end walls 12 and 14. In order to prevent the oil from passing between the'rotor end walls 34y and 86 and the respective adjacent inner faces of the housing end walls 12 and 14 and out into the working chambers 32 where the oil may mix withvgases for combustion, oil se-al Ymeans are provided with said oil seal means generally comprising any annular oil seal member or ring 1%@ which is preferably made `of iron and is mountedin an annular groove 102 in each of the rotor end faces 8 4 and $6 and positioned radially inwardly with respect to the rotor end farce seals 34.

In the pastxsuch oil seals generally'comprised seal members of resilient material such as rubber-like material or metal seal members with springs for biasing said seal members into sealing engagement or metallic seal members having inherent spring characteristics. It has been found, however, that these seal members of rubber-like material in some cases became plastically deformed while the metal seals were at 'times subject to twisting or pivoting in their seal grooves which caused a loss of sealing contact between .the inner faces of the housing end walls 12. and 14 and the seal members, It has been further found particularly with rotary engines having a'peripheral intake port, as illustrated, that with certain prior oil seal constructions the-seal members are affected by gas pressurek from the working chambers which ylay-passed the end face seals` and escaped into the region between the rotor end walls and housing end walls. This gas pressure would act on ythe seal members to `unbalance the forces thereon and cause said seal members to pivot and deect away from their contacting engagement with the inner face of the housing end walls which would result in permitting oil to leak past the oil seal. It will -be apparent from the following description that the present invention Veliminates these defects in the prior art devices.

Referring now to FIGS. 3 and 4, each oil seal ring 100 is illustrated as being positioned in its seal groove 102 which is co-axial with the rotor axis and is disposed adjacent to the rotor hub. The seal member preferably has a sloping seal face 164 for providing a scraping-edge contact with the housing end Walls 12 and 14 with said edge being theV radially inner` edge of said sloping seal face 1&4.- With this construction the oil will be effectively scraped downwardly or radially inwardly by the seal member whereby oil leakage` radially outwardly past the seal member 16) is minimized. A-conicalannular metallic ring or Belleville-type springpld is positioned between each seal ring 1th? andthe bottom of its seal groove 192. The Belleville springlltl has a force cornponent against its sealfrng lo@ which is directed substantially parallel to the engine axis, as illustrated in FIG. 4 by thearrows designated F, and the spring 196 is positioncd with yrespect to the seal ring 10d such that the axial force F is on a line passing through the contacting edge of the seal face 1614 andthe inner .face of the housing end' wall. As will be apparent, the spring/,106 will urge the seal Amember 1d() into sealing contacting engagement with its adjacent housing endwall and since the axial spring force F passes through the line 0f contact of the seal member and the housingV end wall, any turning moments or coupling forces resulting from said spring force and tending to twist or pivot the oil seal ring in its groove are eliminated.. It `should be understood that,

. the contacting edge'of the tened surface and during the vrunning lite of the engine seal member is a slightly hatthis surface may become slightly more llattened. However, lthe spring force acts Substantially through the center of the region of contact of .the seal member even alter. `substantial Wear of said seal member.

. The use of the Bellevilletype spring 1% in cooperation with theseal element lill? of the present inventionhas.

been .found to be particularly advantageous.

Firstly, the components of the spring force and their direction can be readily determined'. Therefore, when using this type of spring, the biasingforce for maintainingthe seal inember 166 in sealing contact can be accurately oriented with of the seal-member in its groove and affect its sealing i el-liciency,

- 32 may leak past the end face seals 34 between the rotor unbalance of gas pressure forces on the oil seal ring might respect -.to the seal contact region of the seal ring itl@ so '..tphat said biasing force willr not produce any coupling forces on the seal member which would res-ult in turning Secondly, a Belleville-type spring effectively utilizes a Y relatively higher percentage'of the Volume of spring material for doing spring work than other forms .of springs such as coil Orgivave springs. 1 Thus, the tension-compression characteristics around the annular Belleville-type v f Y v n pressure acting upon aseal ung lil@ will act on substanspring member during' deliection yofthe spr-ingfare such that a relatively 'large percentage of the spring material can'operate at the .stress-limit which therefore' makes it possible to get more :effective work perunit vvolume of*V spring material. j It hasfbeen found that-the eltective utilization of thespring material in a Belleville-type spring is `slightly higher than a coil-type spring and ksubstantially higher .than a wave-type spring. A particular ,advantage of the relatively high etective utilization of spring material in aBelleville-type spring in the present invention -lies in the fact that, design limitations require a maximum i effective vutilization of spring material for use in a vminimum area. lt is required that the oil seal grooves le?. in

the rotor end faces'be kept as small ais-possible so that thestructural characteristics of the rotor are notdisturbed and because there is a minimum area -in said rotorend .faces for locating the oil seal groove, particularly onv the gear side of the rotor. Althougha coil spring approaches the desired effective utilization ofy volume of Spring material for doing springwork, the overall size of the coil spring or the number of such'springs which must be used for obtaining the requiredspring action for maintaining sealing contact between the seal member and the housing end Wallsvis such as to make its use .prohibitive in the limited area of the oil seal groove.

spring to use -a relatively 'smaller' vspring member for obtaining a maximum eiective ut1lization of volume of spring material within'the limited` area of` the oil sealy groove,A as compared tothe etectiveutilization of spring material and relative size of coil-type or wave-type springs. y l 4 A third advantage of a Bellville-type spring in the present invention lies in the force-deflection characteristics of this type of spring.,k For a given volume of spring material, a Bellcvilleftype spring has a relatively large spring delection per unit of spring force. This meansv that, during slight'axial motion of the rotor relativeto the .housing during engine operation, there'will be relatively little variation in the contact force of the seal member against the housing end wall. Fromthe above discussion Therefore, with the design limitations on the size of the oil seal groove in lthe rotor end Walls, Vit is possible with a Belleville-type result in deflection of the seal ring which might force the seal member out of sealing contact withfthe inner face ot the adjacent housingend Wall with resultingleakage of oil past the seal member.

With the oil seal construction.illustrated, any gas pressure between the gas seals 34 andthe oil seal ring 10! at -a rotor end face not only acts on the seal face 104- to urge the seal ring axially into its groove N2 away from the adjacent housingfend wall but this gaspressure can also ilow through the clearance 11.98 intothe seal groove 'to2 behind the seal ring' litio, as illustrated by arrows G in FIG. 4, this 'latter gas pressure urging thesealring litt axially outwardly toward the adjacent housing end wall. As.illustrated in FIG. 4 the forces from theA gas tially equal areas on both Sides of theseal member in,v

opposition to one another and will therefore substantially cancel each other out. vThe gas pressure which is also;

' cent yhousingfend Wall providing Contact is not lost between spring lll and groove M2, and the spring loadand dimensions are always selected. so that this cannot occur. K

Therefore, with respect to the forces dueto gas pressure, thenoil seal ring 10) willv be ysubstantially, balanced kand noldeliection will result from the gas pressure torcesj This construction is particularly advantageous in a rotary combustion engine having its intake'port located inthe peripheral wall, asillustrated in FIG. 2. In this vcase the gas pressure, whichV may enter the area adjacent the oil seal groove 102, may become relatively high due to the compression and combustion of the gases in the Working chambers and the gas pressure may have a critical effect on the actiony of the oil seal member lill?. Ther problem is not as critical, however, in an engine having the intake port located in one of the end walls since, in this case, the region between the side faceseals 34 and the oil seal member ltltl periodically becomes exposed to the intake port wherein the pressure is substantially equal to atmosphericV pressure'. Thus, thepressure in this region will be periodically reduced and relieve the pressure from .the gases acting on the oil seal member lltltl. .Al rotary combustion engine utilizing an intake port in one of the 'Y end Walls may be seen in United States Patent 3,033,180,

issued on May 8, 1962, to Max Bentele.

With furthervrei'erence to FIGS.V 3 and 4, .a separate resilient seal member 110 which as illustrated, may bek an O ring seal of rubber-'like material is preferably provided Vbetween the seal ring ltltl and the bottom portion or radially inward wall of the .seal groove M2. The seal member Vlill serves to prevent oil from leaking between the bottom portionof the seal ring 160 and the adjacent Wall of the seal groove M2.,` The rubber seal member 1lb may also be located between the seal groove andl the yradially'outward portion of thev seal member lilo for providing the same function but then theaforementioned balancing of the gaspressure forces is no longer provided. The Bellevillespring 166 may also be coated with an elasticvmaterial 111 such as rubber (FIG. 4) `to provide further sealngwithin the seal groove T102 to seal against .any oil which may leak past the seal member llt). How' over, when spring 106 is coated, the seal member lill may be eliminated since the coating on the spring 1M func- 't1ons in the same manner as the seal member lill. Drain pass ages (not shown) 'may also be provided in each oil Seal groove 192 to drainany oil present in said grooves intov the interior compartments 74 of the rotor.

araches As also illustrated in FIGS. 1-4, `the rotor end walls *34Y and 86 may have portions with a larger Width-radially inwardly of the oil seal grooves 102 than the width of said Vrotor end Walls radially outwardly of said oil seal grooves 162, said portions being designated at 112 and 114, to provide less clearancebetween these portions Vof the rotor end walls and therhousing end walls than between the rotory end walls and housingl end walls radially bers as well as reducing the possibility of oil leakage' past said seal members, Since the portions 112 and l1-i and the adjacent portion of the housing end walls 12 and 1li will be substantially constantly wetted by oil from the cavity 94, these portions will be well lubricated to provide an axial thrust bearing' between the rotor and housing end Walls; For greater details of this rotor end` wall constructiom reference maybe made to copendingV application entitled Rotor and Seal Constructionfor vRotary 1 AlViechanisms invented by Charleslones.

11n FIG. .5 there is shown another: embodimentV ofY the invention with like elements having like numerals. As shown therein, Vthe rotor 22 is provided with oil seal grooves 1112 having oil seal rings 11d, which kare also preferably iron,` positionedfadjacent the bottom portions or Yradially inwardportions of said seal grooves 192. The oily 'seal ringsf116 have sloping seal faces 194i similar to those 'of seal members 1% for scraping contact with the inner faces of the housing end walls 12 and 14, respectively.

Each oil seal ring 116 is biased into sealing contact with the inner face .of the housing end wall adjacent to it by a Belleville spring1tl6 which, as `in the case of the 'ernbodiment described above, hasan axial force component which Vpassesthrough the center of contact between the seal member 116 and the inner face of the adjacent housing end wall. Inv this embodiment, however, the spring 1536 has a molded ring 118 of elastic material, such as rubber, bonded thereto, which ring 11S when in a compressed position, as illustrated in FIG. 5, seals against Vthe ,rotor and the seal member 115. Obviously, the LBelleville spring'ld in FIGS. 3 and 4 may likewisehave a molded rubber ring 11S bonded` thereto in lieu of the rubber 'seal 116 or Ythe, coated spring member 166.

The ring 11S is deliberately formed so that, previous toY assembly in the seal groove 192, said ring 118 has a larger height than the Belleville-typeV spring 196 to which' said ring 113 'is bonded. Before assembly into the seal; groove, the oil seal ring 116 is squeezed against the com-v pressible ring member 118 so that the two-piece construction of the oilseal ring'116 and the spring lite-ring 11S .combination can lbe handledas if it were a one-piece con-rY of the metallic Belleville spring 106 into a one-piece construction. In some previousfseal constructions rubber ringsl were relied upon to not only seal Abut to act as a spring for biasing the seal member into sealing contact. Eventually, however, these rubber rings lose their resiliency which reduces their spring andsealing characteristics. It will also be apparent that the use of a separate `metallic spring does not overcome this problem since Athe E9 unit wherein these characteristics'can be utilized to overf come the problem faced when using theseelements separately. Since the ring 11,8 only seals against cylindrical portion 12b of the oil seal ring .Maand because of the compressibility of the elastic material of the ring 11S the oil seal ring 116 may moveraaiallywithin the Vseal groove 102 to adjusty to the end housing Without losing sealing contact with the ring 118.k Thus, the ring member 11S will seal against oil leakage around theoil. seal ring 116 and outward into the workinggchambers 32 Yand the Belleville springfltd Will'lreep the-oil'seal ring 116 in sealing Contact while eliminatingrturninggof the' oil seal ring 116 in its groove 192. Howev'erthe `seal construction of the embodiment of FIGJ is not pressure balanced as in theV case ofthe seal construction illustrated in FiGS.

1-4. it .should be understood however, that means mayl be provided for pressure balancing the `oil seal ring 116 in its groove asin thecase of the Seal member 161i. i

From the above description it will be'apparent that a novel and improvedoil seal construction is provided .in

which the .oil seal is kept in substantiallyconstant -seall ing contact for preventing any oil lealragefpast said oil seal. The preferred embodiment. of .theinvention substantially elirninatesadverse forces which may act on the oil seal vto canseit to lose its'y sealing contact through a novel cooperation or" a spring andseal member construction and provision forv balancing the gas pressure forces actlng on the seal'member.`

While the ,invention has been specifically set forthin detail inits preferred form in Ytheabove description, lit should befunderstood that itis intended Vthat the invention is not toV be Vso limited thereby and; it will be obvious to those sblled inthe artthat various changes and modifications maybe made Awithout departing from therspirit and scopeV of theV invention.` Weintend tocover all such vmodificationsl inthe appended claims.V

We claim:

anism having an outer body including a peripheral wall interconnected with a'pair of'endwalls forming a cavity; a shaft rotatably supported in said outer body'and having an eccentric portion thereon-loca-tedlin1said cavity; a rotorfvrot'atably Vjournaled on said eccentric portion with said rotor including a peripheral wall interconnected with pair of end walls, said rotor vperipheral wallhaving a pluralityof circumferentially-spaced portions for continuous sealing cooperation with the inner surface of said outer body pheripheral Wallto `deiine working Vchambers between the outer body and said rotor which upon relative rotatiou'of said outer ybody and said rotorV vary in Volume; means for supplying oil to said rotatable shaft for lubrication of said shaft during rotation thereof; said rotor and oil seal construction comprisingraxially movable oil seal ring means carried by `each end wall of said yrotor and including seal engaging facesthe proileof which' provides a substantially edge. Contact sealing surface for sealing cooperation with 'said outer body end walls4 fory minimizing oil ilow radially outwardly between the :rotor end walls `and theV outer bodyend walls; .and metallic Belleville-type spring means for axially. urging said oil seal ring means into sealing engagement with said outer body end walls and said metallic VBelleville-type spring means directlyengaging an associatedend wall vof said rotor and a regionV behind its associated oil seal ring'means with the region of engagementbetween said metallic Belleville-typel spring means and said oil seal-ring means being'so located springby itself does not have ,adequate scalingcharacteristics. The one-piece elastic member and spring construcmeans passes through the substantially edgecontact` scaling surface of said oil'seal rring means.Y

2. A-rotor and oil seal construction as recited in claim 1 wherein said oil seal'ring means are mounted in a seal rgroove in each rotorend'wall; and :an elastic seal member lpositioned in said seal groove Vand cooperatively engaging each oil seal ring means and its associated-'seal groove so that oil will be prevented fromentering said seal groove andl owing around the `oil'seal coating of elastic material vto provider sealing between the 'mating surfaces of said Belleville-type spring, said seal groove and said oil seal ring ymeans so that oil is 'prevented from flowing around oil seal ring means and into said yworking chambers.V I

4.*A rotor and oil seal construction as recited in claim l1 wherein each said `oil seal ring means is mounted in a seal groove having slightly larger dimensions than its associated `oil seal ring means; and said Belleville-type spring means including an elastic ring molded thereto for providing sealing contact between said seal groove and said oil seal ring means for preventing oil from flowing around said oil seal member and into said working vcham- 5. A rotor and `oil seal construction as recited in claim` 1 wherein saidrotor has a greater width radially inward of saidoil seal means than the lwidth of said rotor radially outward of said oil means so that the flow of oil radially outward toward said oil seal means between said rotor f end walls and said outer body end walls is limited.

" surface in avradially outward'direction to leave a space 1 wherein said Belleville-type spring means includes a v l@ between the contacting portion of said seal engaging face with the outer body end wall and the radially outward wall of said oil seal ring so that gas pressure from the working chamber mayact onthe diverging portion of said seal engaging face, said oil seal'ring means being mounted in a groove in each rotor end wall with the groove having larger dimensions than its associated oil'seal ring so rthat gas pressure from the Working chambers may enter said groove and act behind saidoil seal ring and the area behind said voilseal ring and the area of said diverging portion of said seal engaging `face upon'which said gas pressure may act being substantially equal so that the gas pressure acting on said oil seal ringvmeans will be balanced.

, References Cited by the Examiner UNITED STATES PATENTSv 2,352,784 7/44 Geyer -..L 277-90 2,868,562 1,/59 Heimbuch s 277-'38 l 2,979,042 4/61 Bemele 1123-8 2,985,475 ,5/61 Peickii etal 277-38 v FOREIGN PATENTS 599,170- 5/60 '.Canada.

LAURENCE V. EFNER, Prifmzfyincaml'ner.` rROBERT M. WALKER, Examiner. 

1. A ROTOR AND OIL SEAL CONSTRUCTION FOR A ROTARY MECHANISM HAVING AN OUTER BODY INCLUDING A PERIPHERAL WALL INTERCONNECTED WITH A PAIR OF END WALLS FORMING A CAVITY; A SHAFT ROTATABLY SUPPORTED IN SAID OUTER BODY AND HAVING AN ECCENTRIC PORTION THEREON LOCATED IN SAID CAVITY; A ROTOR ROTATABLY JOURNALED ON SAID ECCENTRIC PORTION WITH SAID ROTOR INCLUDING A PERIPHERAL WALL INTERCONNECTED WITH A PAIR OF END WALLS, SAID ROTOR PERIPHERAL WALL HAVING A PLURALTIY OF CIRCUMFERENTIALLY-SPACED PORTIONS FOR CONTINUOUS SEALING COOPERATION WITH THE INNER SURFACE OF SAID OUTER BODY PERIPHERAL WALL TO DEFINE WORKING CHAMBERS BETWEEN THE OUTER BODY AND SAID ROTOR WHICH UPON RELATIVE ROTATION OF SAID OUTER BODY AND SAID ROTOR VARY IN VOLUME; MEANS FOR SUPPLYING OIL TO SAID ROTATABLE SHAFT FOR LUBRICATION OF SAID SHAFT DURING ROTATION THEREOF; SAID ROTOR AND OIL SEAL CONSTRUCTION COMPRISING AXIALLY MOVABLE OIL SEAL RING MEANS CARRIED BY EACH END WALL OF SAID ROTOR AND INCLUDING SEAL ENGAGING FACES THE PROFILE OF WHICH PROVIDES A SUBSTANTIALLY EDGE CONTACT SEALING SURFACE FOR SEALING COOPERATION WITH SAID OUTER BODY END WALLS FOR SEALING MIZING OIL FLOW RADIALLY OUTWARDLY BETWEEN THE ROTOR END WALLS AND THE OUTER BODY END WALLS; AND METALLIC BELLEVILLE-TYPE SPRING MEANS FOR AXIALLY URGING SAID OIL SEAL RING MEANS INTO SEALING ENGAGEMENT WITH SAID OUTER BODY END WALLS AND SAID METALLIC BELLEVILLE-TYPE SPRING MEANS DIRECTLY ENGAGING AN ASSOCIATED END WALL OF SAID ROTOR AND A REGION BEHIND ITS ASSOCIATED OIL SEAL RING MEANS WITH THE REGION OF ENGAGEMENT BETWEEN SAID METALLIC BELLEVILLE-TYPE SPRING MEANS AND SAID OIL SEAL RING MEANS BEING SO LOCATED THAT THE AXIAL FORCE OF SAID METALLIC BELLEVILLE-TYPE SPRING MEANS PASSES THROUGH THE SUBSTANTIALLY EDGE CONTACT SEALING SURFACE OF SAID OIL SEAL RING MEANS. 